1300 Henley Court
Pullman, WA 99163
509.334.6306
www.digilentinc.com
PmodDA2™ Reference Manual
Revised May 24, 2016
This manual applies to the PmodDA2 rev. B
Overview
The PmodDA2 is a 12-bit Digital-to-Analog converter powered by the
Texas Instruments DAC121S101.
As it is able
to simultaneously convert two separate channels of digital information provided over an interface similar to SPI,
users can easily compare the two reconstructed signals.
Features include:
12-bit digital-to-analog converter
Two simultaneous conversion channels
Very low power consumption
Small PCB size for flexible designs 1.0“ ×
0.8” (2.5 cm × 2.0 cm)
6-pin Pmod connector with GPIO interface
Library and example code available
in
resource center
The PmodDA2.
1
Functional Description
The PmodDA2 provides two channels of 12-bit Digital-to-Analog conversion, allowing users to achieve a resolution
up to about 1mV.
2
Interfacing with the Pmod
The PmodDA2 communicates with the host board via an SPI-like protocol. By bringing the Chip Select line to a low
voltage state, users may send a series of 16 clock pulses on the Serial Clock line (SCLK). The data is sent out with
the most significant bit (MSB) first on the last 12 clock pulses. An example data stream of how the data might look
is provided from the TI datasheet below:
DOC#: 502-113
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page
1
of
2
PmodDA2™ Reference Manual
Figure 1. PmodDA2 data stream.
Pin
1
2
3
4
5
6
Signal
~SYNC
DINA
DINB
SCLK
GND
VCC
Description
Chip Select
Data In for Channel A
Data In for Channel B
Serial Clock
Power Supply Ground
Power Supply (3.3V/5V)
Figure 2. PmodDA2 circuit diagram.
Table 1. PmodDA2 pinout table.
Any external power applied to the PmodDA2 must be within 2.7V and 5.5V; however, it is recommended that
Pmod is operated at 3.3V.
3
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long on the sides parallel to the pins on the
pin header and 0.8 inches long on the sides perpendicular to the pin header.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page
2
of
2
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
